Street Drugs Causing FLESH EATING BACTERIA "Zombie Apocalypse"

If you read the recent posts and news stories, illegal street drugs (bath salts, cocaine, etc.) seem to be at the root of the recent flesh eating bacteria 'zombie' stories that keep popping up.

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-Is that because some drugs have been 'spiked' with the Flesh Eating Bacteria?

-Or is there a common component or ingredient in these drugs that has been mutated to start this epidemic? For example, maybe a large crop of the poppy seeds which codeine is made from have been mutated or genetically modified.

-A less likely possibility offered is that it could be that the injection site is being infected with the bacteria.

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If this 'alteration' to the drugs or the bacteria was done intentionally, that could explain the CDC's warning a year ago... they knew it was being done and that cases would be on the rise as more of the deadly drugs got distributed.

P.S. Are the "Flesh Eating" cases where people are exposed to the bacteria related?

A mutation, alteration, or modification of the bacteria could be the link.